This question has no clear answer. Chemistry of bank cells, charge rate,
discharge rate, age of bank, all play a part in resistance in the bank. One of
the reasons that solar is so great is the reduced drain on the bank when under
way during the daylight hours. I will go out on a limb here. The weakest link
in electric drive is it's batteries, no matter the chemistry. Building a
system that is lean on battery power and strong in generation is the best
system one can engineer. Even if the boat is in a slip or on a ball most of
the time one will be wasting most of the power an array will produce. It is
then prudent in my eyes to over generate and plan to store minimum maneuvering
power based on your location and needs.
For the green freak, like myself, running only on renewable resources has
something to be desired, if on a schedule. An example of schedules are
outrunning a storm. Limited power in cloudy conditions is a serious downside
of renewable resources, though wind power is at it's peak it may not be
available depending on sail selection. Sails hamper solar cells production so
have a down side. The ideal system has both solar and fossil fuel systems. For
such conditions or a deadline. adding a genset for drive power
"engine/electric" is my suggestion. A battery bank that will power the drive
during nighttime use is the ideal size. With a solar array large enough to
charge and cruise depending on expected night time cruising is fine.
I would not plan on charging the bank with a genset as most likely most of the
charging time will be in the slow charge % of the bank, in which solar works
best. So I would reserve my fuel for power underway when needed. I guess that
this configuration would be close to a pluggable hybrid. The pluggable would of
course be the solar power plant. As you think of this apply the plumbing
analogy to help with the flow to understand your path.
Understand this in my opinion and may differ from the rest of the group.
Kevin
On Friday, April 24, 2015 05:47:54 AM you wrote:
> Ken, do you happen to know, off the cuff, what the loss % is, in power
> charged into a battery vs power used at a later time when battery is
> discharged to run the motor? That is, if you had 1000 watts power produced
> in your solar panels for one hour and sent directly to the motor, we know
> how much work that KWhr would do expressed in how far/fast your boat would
> travel...but.if instead we had 1000watts going to charge a
> depleted battery bank for an hour, how much power is typically lost when
> we run the motor later, using that stored power? do you get 1/2 a KWhr
> back out for a full KWhr put in? more? less?. I'm curious what the loss
> ratio is typically.
Posted by: pembertonkevin@gmail.com
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